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Enhanced performance of white organic light-emitting devices based on ambipolar white organic single crystals
- Source :
- Applied Physics Letters. 118:163301
- Publication Year :
- 2021
- Publisher :
- AIP Publishing, 2021.
-
Abstract
- Organic single crystals are highly promising for applications in optoelectronic devices because of their higher mobility and thermal stability than amorphous thin films. Although white organic single crystals have been fabricated by the double-doped method and applied to realize white organic light‐emitting devices (WOLEDs), the unbalanced carrier transport properties of the unipolar crystals severely limit the device performance. Here, ambipolar white organic single crystals are obtained by using mixed p- and n-type molecules as an ambipolar host for the red and green dopants. The white crystal with balanced carrier transport and balanced blue, green, and red emission intensity was applied to the single-crystal WOLEDs. The highest brightness of 1956 cd m−2 and the current efficiency of 1.31 cd A−1 are achieved, which are the best performance of the single-crystal WOLEDs reported to date. A high color rendering index is obtained, which varies between 82 and 87 with increasing driving current. It is expectable that this strategy would support the practical applications of organic single crystal-based OLEDs.
- Subjects :
- 010302 applied physics
Materials science
Physics and Astronomy (miscellaneous)
Dopant
business.industry
Ambipolar diffusion
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Amorphous solid
Color rendering index
Crystal
0103 physical sciences
OLED
Optoelectronics
Thin film
0210 nano-technology
business
Single crystal
Subjects
Details
- ISSN :
- 10773118 and 00036951
- Volume :
- 118
- Database :
- OpenAIRE
- Journal :
- Applied Physics Letters
- Accession number :
- edsair.doi...........4c5ef6cfa85ef3ad927cfbad243bc0a4